Sold My Old MBP - Question About Setting Up As "New"

so i sold my old mbp on ebay and now i wonder whats the best way to reinstall a clean version of mountain lion. ive done it a couple of times with my physical cd of Snow Leopard but i never actually tried to reinstall Mountain Lion from scratch.

i know theres a guide on how to reinstall mountain lion on the apple page obviously but as i'm selling it i'm wondering whats the best way.

i dont want to break it after having it sold lol

can i burn mountain lion on a dvd?

can i boot holding one of those keys (forgot which one) to wipe my SSD and then reinstall it on this SSD from the DVD? or is it necessary to make a bootable usb? how about external harddrive. can i install Mountain Lion from a time machine backup with nothing else but the OS?

and one more question, how long do u think its gonna take to "secure wipe" an 128 SSD?

That won't remove all traces of the former user, as some data is stored outside the user's folder. A clean install is a more secure method to ensure no user information is left behind.

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i just tried the recovery cmd+r method but its telling me there isnt a "LION" copy linked to my ID ... hello? im trying to install mountain lion again not LION and my retina mbp came with Mountain Lion installed. also, when i try to "purchase" it at the store, its telling me "this computer doesnt support mountain lion"

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